How to add time(Days, years, seconds) to Date in Java

Problem Description

How to add time(Days, years, seconds) to Date?

Solution

The following examples shows us how to add time to a date using add() method of Calender.

import java.util.*;

public class Main {
   public static void main(String[] args) throws Exception {
      Date d1 = new Date();
      Calendar cl = Calendar. getInstance();
      cl.setTime(d1);
      System.out.println("today is " + d1.toString());
      cl. add(Calendar.MONTH, 1);
      System.out.println("date after a month will be " + cl.getTime().toString() );
      cl. add(Calendar.HOUR, 70);
      System.out.println("date after 7 hrs will be " + cl.getTime().toString() );
      cl. add(Calendar.YEAR, 3);
      System.out.println("date after 3 years will be " + cl.getTime().toString() );
   }
}

Result

The above code sample will produce the following result.

today is Mon Jun 22 02:47:02 IST 2009
date after a month will be Wed Jul 22 02:47:02 IST 2009
date after 7 hrs will be Wed Jul 22 09:47:02 IST 2009
date after 3 years will be Sun Jul 22 09:47:02 IST 2012